Hi Sam - I'm far from an expert in this but what I typically do and seems to work is to copy the web address and then just paste it into the text. Apparently, the computer program converts it to an abbreviated visual version but the link becomes an active hyperlink automatically.
When I add a link, I do the copy/paste and then go to Preview and test it before posting so I can click on the link myself to see if it's active.
Sample
[
www.afibbers.org]
Hope this helps.
Jackie